Immune suppressive molecule that inhibits antigen-specific T- cell activation by acting as a ligand of LAG3 (PubMed:30580966, PubMed:35761082, PubMed:40101708). LAG3-binding initiates a signaling that inhibits the T-cell receptor (TCR) in the immunological synapse, preventing T-cell activation (PubMed:30580966). Binds LAG3 independently from MHC class II (MHC-II) (PubMed:30580966, PubMed:35761082). Secreted by, and promotes growth of, hepatocytes (PubMed:11470158, PubMed:19880967). {ECO:0000269|PubMed:11470158, ECO:0000269|PubMed:19880967, ECO:0000269|PubMed:30580966, ECO:0000269|PubMed:35761082, ECO:0000269|PubMed:40101708}. This is the function of FGL1 (fibrinogen like 1, ENSG00000104760).